/*
 * Copyright 2002,2003 The Apache Software Foundation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package cn.taketoday.context.cglib.proxy;

/**
 * All enhanced instances returned by the {@link Enhancer} class implement this
 * interface. Using this interface for new instances is faster than going
 * through the <code>Enhancer</code> interface or using reflection. In addition,
 * to intercept methods called during object construction you <b>must</b> use
 * these methods instead of reflection.
 *
 * @author Juozas Baliuka <a href="mailto:baliuka@mwm.lt">baliuka@mwm.lt</a>
 * @version $Id: Factory.java,v 1.13 2004/06/24 21:15:20 herbyderby Exp $
 */
public interface Factory {
  /**
   * Creates new instance of the same type, using the no-arg constructor. The
   * class of this object must have been created using a single Callback type. If
   * multiple callbacks are required an exception will be thrown.
   *
   * @param callback
   *         the new interceptor to use
   *
   * @return new instance of the same type
   */
  Object newInstance(Callback callback);

  /**
   * Creates new instance of the same type, using the no-arg constructor.
   *
   * @param callbacks
   *         the new callbacks(s) to use
   *
   * @return new instance of the same type
   */
  Object newInstance(Callback[] callbacks);

  /**
   * Creates a new instance of the same type, using the constructor matching the
   * given signature.
   *
   * @param types
   *         the constructor argument types
   * @param args
   *         the constructor arguments
   * @param callbacks
   *         the new interceptor(s) to use
   *
   * @return new instance of the same type
   */
  Object newInstance(Class<?>[] types, Object[] args, Callback[] callbacks);

  /**
   * Return the <code>Callback</code> implementation at the specified index.
   *
   * @param index
   *         the callback index
   *
   * @return the callback implementation
   */
  Callback getCallback(int index);

  /**
   * Set the callback for this object for the given type.
   *
   * @param index
   *         the callback index to replace
   * @param callback
   *         the new callback
   */
  void setCallback(int index, Callback callback);

  /**
   * Replace all of the callbacks for this object at once.
   *
   * @param callbacks
   *         the new callbacks(s) to use
   */
  void setCallbacks(Callback[] callbacks);

  /**
   * Get the current set of callbacks for ths object.
   *
   * @return a new array instance
   */
  Callback[] getCallbacks();
}
